Something to note about 50-yr/100-yr/X-yr flood lines: Those are the levels that floods are projected to reach **at least once** every X years. It is NOT a probability statement in the way that many people take it - it does not mean that floods will hit a given level only once every X years.
I doubt that the civil engineer who corrected my long-held misunderstanding would agree that the lines are arbitrary. The lines aren't re-drawn every year; insurance rates & development plans obviously hinge on longer-term projections. It's a tough decision about when to re-draw, because lots of new development brings more paved & low-perm surfaces and increased runoff, but do you wait until the floods happen or try to forecast what will happen, not just because of one project but the totality of many? In relatively undeveloped areas, developers would cry foul, saying "But that area has never flooded", which is likely a correct statement, and local officials have little other data to go on in making their decisions.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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